Cavitation-Free Buckets of YS-920 and NACA 66 (MOD) Foil Sections, Y.T. Shen, Jul 82 (0126)
Based on a wing section design theory and boundary layer calculations, a new series of hydrofoil sections with improved cavitation inception characteristics were theoretically developed and presented in previous papers. To verify these theoretical results experimentally, two hydrofoil models, one a newly developed profile designated YS-920 and the other a NACA-66 (MOD) wing section, were tested in a high-speed water tunnel at California Institute of Technology, The measurements included force and moment data, flow visualization, cavitation characteristics, and surface roughness effect on cavitation In this report, the measured cavitation-free buckets of YS-920 and NACA-66 (HOD) foil sections are presented and compared with theoretical predictions. The ability to achieve a significant delay in cavitation inception with a newly designed profile is clearly demonstrated experimentally.